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Program of the International CECAM-Workshop
Correlated electron physics beyond the Hubbard model

Bremen Center for Computational Materials Science - BCCMS 
University of Bremen, February 4th - February 8th 2019

Monday, February 4th 2019 (Radisson Blu Hotel Bremen)

18:00

21:00

 

Arrival and Registration

Tuesday, February 5th 2019 (House of Science Bremen, Downtown)

08:00

08:50

 

Registration

08:50

09:00

 

Opening and welcome, Tim O. Wehling

Session:

 

Dynamical Mean Field Theory and diagrammatic extensions thereof

 

 

Chair: Andrew Millis

09:00

09:40

 

Philipp Werner, University of Fribourg, Switzerland
GW+DMFT simulation of lattice models in and out of equilibrium

09:40

10:20

 

Alexander I. Lichtenstein, University of Hamburg, Germany
Nonlocal correlated effects in magnetic materials

10:20

10:50

 

Coffee Break

10:50

11:30

 

Erik van Loon, University of Bremen, Germany
Dual boson approach to spatial correlations

11:30

12:10

 

James P. F. LeBlanc, Memorial University of Newfoundland, St. John’s, Canada
Hubbard-like models: challenges and solutions via analytic treatments of numerical problems

12:10

12:15

 

Group Photo

12:15

13:50

 

Lunch Break (Restaurant Q1) and Coffee

Session:

 

Quantum Cluster Approaches

 

 

 

 

Chair: Silke Biermann

13:50

14:30

 

Johannes Lischner, Imperial College London, United Kingdom
Many-body perturbation theory beyond GW

14:30

15:00

 

Coffee Break

15:00

15:40

 

André-Marie S. Tremblay, University of Sherbrooke, Québec, Canada
Antagonistic effects of nearest-neighbor repulsion on the
superconducting pairing dynamics in the doped Mott insulator regime

15:40

16:20

 

Round Table Discussion
Diagrammatic and cluster extensions of DMFT: where are we?

18:20   Pickup to Welcome Reception (The Bremen Town Musicians, the statue near the town hall)

18:30

21:30

 

Welcome Reception (Bremen Town Hall)

Wednesday, February 6th 2019 (House of Science Bremen, Downtown)

Session:

 

Coupled cluster, FCIQMC and related quantum chemical
approaches

 

 

 

 

Chair: Philipp Werner

09:00

09:40

 

Lucas K. Wagner, University of Illinois at Urbana-Champaign,
Illinois, USA
Model Hamiltonians from ab-initio quantum Monte Carlo calculations

09:40

10:20

 

George Booth, University of Cambridge, United Kingdom
´Static´ mean-field theory, ´Dynamical´ mean-field theory, and ´Static Dynamical´ mean-field theory

10:20

10:50

 

Coffee Break

10:50

11:30

 

Silke Biermann, Ecole Polytechnique, Palaiseau, France
Non-local interactions and non-local correlations: examples of dynamical mean field calculations for realistic materials

11:30

12:10

 

Tianyu Zhu, California Institute of Technology, Pasadena, California, USA
Correlated Green`s functions in materials: towards an ab initio treatment of the Kondo problem

12:10

13:50

 

Lunch Break (Restaurant Q1) and Coffee

Session:

 

Constrained many-body perturbation theory, density functional theory and related methods I

 

 

 

 

Chair: Shan-Wen Tsai

13:50

14:30

 

Matteo Cococcioni, Swiss Federal Institute of Technology, Lausanne, Switzerland
Ab initio modeling of transition metal compounds using the extended DFT+U+V with self-consistent Hubbard parameters

14:30

15:10

 

Ferdi Aryasetiawan, Lund University, Sweden
The impact of long-range interaction on the electronic structure of correlated materials

15:10

15:50

 

Malte Rösner, Radboud University, Nijmegen, The Netherlands
cRPA simulations of layered materials

15:50

16:20

 

Coffee Break

16:20

17:00

 

Ryotaro Arita, University of Tokyo, Japan
Self-energy variational approach to correlated electron systems

17:00

17:40

 

Malte Schüler, University of Bremen, Germany
The Peierls-Feynman variational principle: applications to the extended Hubbard model and real materials

17:40

18:20

 

Round Table Discussion
Towards real materials: all ab-initio versus hybrid approaches in the wave function, Green function and density functional domain

18:40

 

 

 

Bus Pickup to Conference Dinner (Radisson Blu, Wachtstraße)

19:00

22:30

 

Conference Dinner (Restaurant Juergenshof)

Thursday, February 7th 2019 (House of Science Bremen, Downtown)

Session:

 

Lattice Quantum Monte Carlo

 

 

 

 

Chair: Johannes Lischner

09:00

09:40

 

Stefan Wessel, RWTH Aachen University, Germany
Nonlocal density interactions in auxiliary-field quantum Monte Carlo simulations

09:40

10:20

 

Thomas Devereaux, Stanford University, California, USA
Metallic transport, CDWs, and pairing without quasiparticles in the Hubbard model

10:20

10:50

 

Coffee Break

10:50

11:30

 

Andrew Millis, Flatiron Institute, City of New York, New York, USA
Ground-state properties of the hydrogen chain, and beyond

11:30

12:10

 

Sandro Sorella, International School for Advanced Studies (SISSA), Trieste, Italy
New insights in the sign problem within the auxiliary field quantum Monte Carlo technique

12:10

13:50

 

Lunch Break (Restaurant Q1) and Coffee

Session:

 

Diagrammatic Monte Carlo

 

 

 

 

Chair: Ryotaro Arita

13:50

14:30

 

Boris Svistunov, University of Massachusetts Amherst, Massachusetts, USA
Polynomial complexity despite the fermionic sign

14:30

15:10

 

Nikolay Prokofiev, University of Massachusetts Amherst, Massachusetts, USA
Dirac liquids and interacting topological insulators by Diagrammatic Monte Carlo

Session:

 

Functional Renormalization Group

15:10

15:50

 

Sabine Andergassen, University of Tübingen, Germany
Multiloop functional renormalization group for response functions

15:50

16:30

 

Shan-Wen Tsai, University of California Riverside, California, USA
Effects of retardation in the renormalization group approach to interacting fermions

17:25

 

 

 

Poster Mounting

17:30

21:00

 

Poster Session + Catering Buffet (House of Science)

Friday, February 8th 2019 (House of Science Bremen, Downtown)

Session:

Constrained many-body perturbation theory, density functional theory and related methods II

 

 

 

 

Chair: Tim O. Wehling

09:00

09:40

 

Carsten Honerkamp, RWTH Aachen University, Germany
Effective interactions from cfRG

09:40

10:20

 

Alexander Steinhoff, University of Bremen, Germany
GW+T-Matrix approach to the excitonic Mott transition

10:20

10:50

 

Coffee Break

10:50

11:30

 

Mark van Schilfgaarde, King’s College London, United Kingdom
QSGW+DMFT: accurate, nearly ab initio many-body treatment of strong correlations

11:30

12:30

 

Concluding Round Table Discussion
How to approach correlated materials with non-local interactions realistically: next steps

12:30

12:45

 

Closing words and Departure